I just received a QA401 and I have a question about the result of the measurement I'm getting

I don't understand why the fundamental frequency is so far below 0db, this is giving me a false distortion reading as well.

 

What is the input voltage?
What is the input attenuator set to?

 

If you're not already familiar with the difference between relative dB measurements and absolute measurements like dBV, these links should help:

https://en.m.wikipedia.org/wiki/Decibel#Voltage

http://www.sengpielaudio.com/calculator-db-volt.htm